Detect which /dev/ttyACM is open

Question

Is their a command that returns what /dev/ttyACM* is open. At some stage in the script it disconnects the usb and reconnects but the ACM increments after this so the variable port = /dev/ttyACM0 now is /dev/ttyACM1. I want to detect which /dev/ttyACM* is open. So port = return (command to find ACM)

Answer 1

Using glob and serial, this should do the trick:

import glob
import serial

def find_ports():
    ports = glob.glob('/dev/ttyACM[0-9]*')

    res = []
    for port in ports:
        try:
            s = serial.Serial(port)
            s.close()
            res.append(port)
        except:
            pass
    return res